阅读说明：本技术 一种用于立柱缝纫机的旋梭传动装置 (Rotating shuttle transmission device for upright column sewing machine ) 是由 张金法 黄贤华 陈建复 于 2020-06-03 设计创作，主要内容包括：本发明涉及一种用于立柱缝纫机的旋梭传动装置,立柱缝纫机包括立柱座体(1)和设于立柱座体(1)上方的机针(2),旋梭传动装置包括旋梭(3)和传动机构(4)。其中旋梭(3)转动固定于立柱座体(1)内,并且旋梭(3)的轴线与机针(2)的轴线垂直；传动机构(4)固定于立柱座体(1)上,传动机构(4)包括主动同步带轮(41)、与旋梭(3)固定的从动同步带轮(42)、以及绕过主动同步带轮(41)和从动同步带轮(42)并首尾相连形成闭环的传动带(43)。本发明可以减小面线在旋梭处形成的线环与机针间的折角,从而使得面线的收线更加顺畅,相应地使得缝纫线迹更加美观。(The invention relates to a rotating shuttle transmission device for a column sewing machine, the column sewing machine comprises a column base body (1) and a machine needle (2) arranged above the column base body (1), and the rotating shuttle transmission device comprises a rotating shuttle (3) and a transmission mechanism (4). Wherein the rotating shuttle (3) is rotationally fixed in the upright post seat body (1), and the axis of the rotating shuttle (3) is vertical to the axis of the needle (2); the transmission mechanism (4) is fixed on the upright post seat body (1), and the transmission mechanism (4) comprises a driving synchronous pulley (41), a driven synchronous pulley (42) fixed with the rotating shuttle (3), and a transmission belt (43) which bypasses the driving synchronous pulley (41) and the driven synchronous pulley (42) and is connected end to form a closed loop. The invention can reduce the break angle between the thread loop formed by the upper thread at the rotating shuttle and the machine needle, thereby ensuring that the take-up of the upper thread is smoother and correspondingly ensuring that the sewing stitch is more beautiful.)

1. A rotating shuttle transmission device for a column sewing machine, the column sewing machine comprises a column base body (1) and a machine needle (2) arranged above the column base body (1), the rotating shuttle transmission device comprises:

the rotating shuttle (3) is rotationally fixed in the stand seat body (1), and the axis of the rotating shuttle (3) is vertical to the axis of the needle (2); and

the transmission mechanism (4) is fixed on the stand column base body (1), the transmission mechanism (4) comprises a driving synchronous pulley (41), a driven synchronous pulley (42) fixed with the rotating shuttle (3), and a transmission belt (43) which bypasses the driving synchronous pulley (41) and the driven synchronous pulley (42) and is connected end to form a closed loop, and the driving synchronous pulley (41) drives the rotating shuttle (3) to rotate through the transmission belt (43) and the driven synchronous pulley (42).

2. The rotating shuttle transmission device according to claim 1, wherein the driven synchronous pulley (42) is fixed with the rotating shuttle (3) through a rotating shuttle transmission shaft (44), one or more bearings (441) are sleeved on the rotating shuttle transmission shaft (44), and the one or more bearings (441) are fixed on a fixed seat (442) fixed with the column seat (1).

3. The rotating shuttle transmission device according to claim 2, wherein a stop portion (443) is circumferentially arranged at one end of the rotating shuttle transmission shaft (44) close to the rotating shuttle (3), the bearing (441) is arranged between the stop portion (443) and the driven synchronous pulley (42), the bearing (441) comprises an inner ring and an outer ring which rotate relatively, the inner ring of the bearing (441) respectively abuts against the stop portion (443) and the driven synchronous pulley (42), and the outer ring of the bearing (441) is fixed with the fixed seat (442).

4. The rotary shuttle transmission device according to claim 3, wherein the number of the bearings (441) is two, two of the bearings (441) are axially arranged along the rotary shuttle transmission shaft (44), and a stop collar (444) is arranged between the two bearings (441), the stop collar (444) is fixed with the fixed seat (442), wherein the inner ring and the outer ring of one of the bearings (441) respectively abut against the stopping part (443) and the stop collar (444), and the inner ring and the outer ring of the other bearing (441) respectively abut against the driven synchronous pulley (42) and the stop collar (444).

5. The rotary shuttle transmission device according to claim 4, wherein a gasket (446) is further arranged between the two bearings (441), the gasket (446) is abutted with the outer ring of one of the bearings (441) and the stop collar (444), and the stop collar (444) is abutted with the outer ring of the other bearing (441).

6. The rotating shuttle transmission device according to claim 3, wherein a tightening gasket (445) abutting against the driven synchronous pulley (42) is detachably fixed to one end of the rotating shuttle transmission shaft (44) far away from the rotating shuttle (3), and the tightening gasket (445) presses the driven synchronous pulley (42) to approach the stopping part (443).

7. The rotary shuttle drive as claimed in claim 2, wherein the bearing (441) is a deep groove ball bearing, a needle bearing or a roller bearing.

8. The rotating shuttle transmission device according to claim 1, wherein a belt pressing mechanism (45) for adjusting the tension of the transmission belt (43) is arranged at the bottom of the column base body (1), the belt pressing mechanism (45) comprises an eccentric shaft (451) and a roller (452) fixed on the eccentric shaft (451), and the roller (452) abuts against the transmission belt (43).

9. The rotary shuttle transmission device according to claim 1, wherein a driving cylindrical gear (46) and a driven cylindrical gear (47) are connected to the driving synchronous pulley (41), the driving synchronous pulley (41) is coaxially and fixedly connected with the driven cylindrical gear (47), and the driven cylindrical gear (47) is meshed with the driving cylindrical gear (46).

10. The rotary shuttle drive according to claim 1, wherein the driving synchronous pulley (41) and the driven synchronous pulley (42) are both gears.

Technical Field

The present invention relates generally to the field of pillar sewing machines. More particularly, the present invention relates to a rotating shuttle transmission for a pillar sewing machine.

Background

A sewing machine is a machine that uses one or more sewing threads to form one or more stitches in a material to be sewn, thereby interweaving or stitching one or more layers of material. The sewing machine can sew fabrics such as cotton, hemp, silk, wool, artificial fiber and the like and products such as leather, plastic, paper and the like, and the sewed stitches are neat, beautiful, flat and firm, and have the characteristics of high sewing speed and simple and convenient use.

The rotating shuttle of the existing upright post sewing machine is a vertical rotating shuttle, and a needle of the upright post sewing machine and the central line of the rotating shuttle are coplanar in the direction vertical to a panel. In the sewing process of the upright post sewing machine, when a thread loop is formed on a rotating shuttle by a surface thread, an obvious bevel angle exists between the thread loop and a machine needle, so that the stitch line appearance degree is poor when the thread is taken up by the surface thread.

Disclosure of Invention

In view of the above-mentioned drawbacks in the prior art, an object of the present invention is to provide a rotating shuttle transmission device for a pillar sewing machine, which can reduce a formed loop and a bevel of a needle when an upper thread forms the loop at a rotating shuttle, so that the take-up of the upper thread is smoother, and accordingly, the sewing stitch is more beautiful.

In order to achieve the purpose, the invention provides the following technical solutions:

in one aspect, the present invention provides a rotating shuttle transmission for a pillar sewing machine, the pillar sewing machine including a pillar base and a needle disposed above the pillar base, the rotating shuttle transmission comprising:

the rotating shuttle is rotationally fixed in the upright post seat body, and the axis of the rotating shuttle is perpendicular to the axis of the needle; and

the transmission mechanism is fixed on the stand column seat body and comprises a driving synchronous belt wheel, a driven synchronous belt wheel and a transmission belt, the driven synchronous belt wheel is fixed with the rotating shuttle, the transmission belt bypasses the driving synchronous belt wheel and the driven synchronous belt wheel and is connected end to form a closed loop, and the driving synchronous belt wheel drives the rotating shuttle to rotate through the transmission belt and the driven synchronous belt wheel.

In one embodiment, the driven synchronous pulley is fixed to the rotating shuttle through a rotating shuttle transmission shaft, one or more bearings are sleeved on the rotating shuttle transmission shaft, and the one or more bearings are fixed to a fixed seat fixed to the stand body.

In one embodiment, a stopping portion is circumferentially arranged at one end, close to the rotating shuttle, of the rotating shuttle transmission shaft, the bearing is arranged between the stopping portion and the driven synchronous pulley, the bearing comprises an inner ring and an outer ring which rotate relatively, the inner ring of the bearing is respectively abutted against the stopping portion and the driven synchronous pulley, and the outer ring of the bearing is fixed with the fixed seat.

In one embodiment, two bearings are arranged along the axial direction of the rotating shuttle transmission shaft, a stop collar is arranged between the two bearings, the stop collar is fixed with the fixed seat, an inner ring and an outer ring of one of the bearings respectively abut against the stop part and the stop collar, and an inner ring and an outer ring of the other bearing respectively abut against the driven synchronous pulley and the stop collar.

In one embodiment, a gasket is further arranged between the two bearings, the gasket abuts against an outer ring of one of the bearings and a stop collar, and the stop collar abuts against an outer ring of the other bearing.

In one embodiment, a tightening gasket abutting against the driven synchronous pulley is detachably fixed to one end, away from the rotating shuttle, of the rotating shuttle transmission shaft, and the tightening gasket presses the driven synchronous pulley to approach the stopping part.

In one embodiment, wherein the bearing is a deep groove ball bearing, a needle bearing, or a roller bearing.

In one embodiment, a belt pressing mechanism for adjusting the tension of the transmission belt is arranged at the bottom of the upright post base, and the belt pressing mechanism comprises an eccentric shaft and a roller fixed on the eccentric shaft, and the roller abuts against the transmission belt.

In one embodiment, a driving cylindrical gear and a driven cylindrical gear are connected with the driving synchronous pulley, the driving synchronous pulley and the driven cylindrical gear are coaxially and fixedly connected, and the driven cylindrical gear is meshed with the driving cylindrical gear.

In one embodiment, the driving synchronous pulley and the driven synchronous pulley are both gears.

Compared with the prior art, the axis of the rotating shuttle is vertical to the axis of the machine needle, and when the upper thread forms a thread loop at the rotating shuttle, the formed thread loop and the break angle of the machine needle are reduced, so that the take-up of the upper thread is smoother, and the sewing stitch is more attractive correspondingly.

Drawings

The above and other objects, features and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:

FIG. 1 is a schematic diagram showing the construction of a rotary shuttle drive according to the present invention;

FIG. 2 is a schematic view showing the construction of a rotary shuttle driving device of a conventional column sewing machine;

FIG. 3 is a schematic view showing another construction of the rotating shuttle transmission according to the present invention;

FIG. 4 is a schematic diagram showing the construction of a rotary shuttle drive according to the present invention;

FIG. 5 is a side view showing a rotary shuttle drive according to the present invention;

FIG. 6 is an enlarged schematic view of a portion of the drive mechanism of the rotary shuttle drive according to the present invention;

FIG. 7 is an enlarged schematic view of a portion of the drive mechanism of the rotary shuttle drive according to the present invention; and

fig. 8 is a partially enlarged schematic view showing a rotary shuttle of the rotary shuttle driving device according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

Fig. 1 is a schematic view showing the construction of a rotary shuttle driving device according to the present invention. As shown in fig. 1, an embodiment of the present invention provides a rotating shuttle transmission device, which may include a rotating shuttle 3 and a transmission mechanism 4, and the rotating shuttle transmission device of the present invention may be used for sewing of a column sewing machine, which may include a column base 1 and a needle 2 disposed above the column base 1. In one embodiment, the rotating shuttle 3 is rotationally fixed in the column housing 1, and the axis of the rotating shuttle 3 is perpendicular to the axis of the needle 2. In addition, the transmission mechanism 4 is fixed on the column base 1, the transmission mechanism 4 may include a driving synchronous pulley 41, a driven synchronous pulley 42 fixed with the rotating shuttle 3, and a transmission belt 43 passing around the driving synchronous pulley 41 and the driven synchronous pulley 42 and connected end to form a closed loop, and the driving synchronous pulley 41 drives the rotating shuttle 3 to rotate through the transmission belt 43 and the driven synchronous pulley 42. Further, two annular barriers are provided on the edges of the driving timing pulley 41 and the driven timing pulley 42, and the distance between the two annular barriers is not less than the width of the transmission belt 43, thereby forming an area for accommodating the transmission belt 43. When the transmission belt 43 passes around the driving timing pulley 41 and the driven timing pulley 42, the transmission belt 43 is located in an interval formed by two annular baffles, so that the transmission belt 43 can be prevented from being disengaged when the driving timing pulley 41 and the driven timing pulley 42 rotate.

Fig. 2 is a schematic view showing a structure of a rotary shuttle driving device of a conventional column sewing machine. As shown in fig. 2, the axis of the rotary hook 200 of the rotary hook actuator of the conventional column sewing machine is parallel to the axis of the needle 2. When the conventional pillar sewing machine is in use, and when the upper thread 5 forms a loop at the rotary hook 200, the loop formed by the upper thread 5 has a significant break angle with the needle 2. Due to the existence of the break angle, the stitch is poor in aesthetic degree when the upper thread 5 is taken up. The axis of the rotating shuttle 3 is vertical to the axis of the needle 2, and the arrangement mode of the rotating shuttle 3 can reduce the formed wire loop and the break angle of the needle 2 when the upper thread 5 forms the wire loop at the rotating shuttle 3, thereby ensuring that the take-up of the upper thread 5 is smoother and the sewing stitch is more beautiful correspondingly. Meanwhile, the invention can also drive the rotating shuttle 3 to rotate through the action of the transmission mechanism 4, thereby forming the upper thread 5 into a thread loop.

FIG. 3 is a schematic view showing another construction of the rotating shuttle transmission according to the present invention; FIG. 4 is a schematic diagram showing the construction of a rotary shuttle drive according to the present invention; fig. 5 is a side view showing a rotating shuttle driving device according to the present invention. The present invention also provides another structure of the rotating shuttle transmission device, as shown in fig. 3, fig. 4 and fig. 5, the column base 1 is fixed on one side of the bottom plate 6, the rotating shuttle 3 is arranged on the top of the column base 1 (the rotating shuttle 3 is arranged on one end of the column base 1 far away from the bottom plate 6), wherein the transmission belt 43 and the driven synchronous pulley 42 are arranged in the column base 1, and part of the transmission belt 43 and the driving synchronous pulley 41 are arranged on the other side of the bottom plate 6. When the rotary shuttle 3 is driven to rotate, the driving synchronous pulley 41 rotates and drives the transmission belt 43 to rotate, and the driven synchronous pulley 42 and the rotary shuttle 3 are driven to rotate in turn. In addition, the rotating shuttle driving device is different from the aforementioned rotating shuttle driving device of the present invention in the connection manner at the driving timing pulley 41, and the connection manner at the driving timing pulley 41 will be described in detail below.

FIG. 6 is an enlarged schematic view of a portion of the drive mechanism of the rotary shuttle drive according to the present invention; fig. 7 is a partially enlarged schematic view showing a transmission mechanism of the rotating shuttle transmission according to the present invention. As shown in fig. 6 and 7, a driving cylindrical gear 46 and a driven cylindrical gear 47 are connected to the driving timing pulley 41, the driving timing pulley 41 and the driven cylindrical gear 47 are coaxially and fixedly connected, and the driven cylindrical gear 47 is meshed with the driving cylindrical gear 46. Further, in practical application scenarios, as shown in fig. 3 to 7, the driving cylindrical gear 46 drives the driving cylindrical gear 46 to rotate (the driving cylindrical gear 46 may be driven by a driving motor or the like provided in the sewing machine). Because the driving cylindrical gear 46 is meshed with the driven cylindrical gear 47, the driving cylindrical gear 46 can drive the driven cylindrical gear 47 to rotate. Since the rotation axis of the driven cylindrical gear 47 is fixed to the rotation axis of the driving synchronous pulley 41, the driving synchronous pulley 41 is driven to rotate when the driven cylindrical gear 47 rotates. Since the driving synchronous pulley 41 is connected to the driven synchronous pulley 42 via the transmission belt 43, the driving synchronous pulley 41 rotates to drive the driven synchronous pulley 42 to rotate via the transmission belt 43. Finally, since the rotating shaft (i.e., a rotating shuttle transmission shaft 44 described later) of the driven timing pulley 42 is fixed to the rotating shuttle 3, the rotating shaft of the driven timing pulley 42 rotates the rotating shuttle 3. That is, the transmission mechanism 4 can sequentially transmit the driving force to the rotary hook 3 through the driving cylindrical gear 46, the driven cylindrical gear 47, the driving synchronous pulley 41, the transmission belt 43 and the driven synchronous pulley 42 so that the rotary hook 3 rotates to complete the sewing operation of the column sewing machine.

In one embodiment, in order to enable the tension of the transmission belt 43 to satisfy that the friction between the driving synchronous pulley 41 and the transmission belt 43 is static friction when the driving synchronous pulley 41 rotates, a belt pressing mechanism 45 for adjusting the tension of the transmission belt 43 may be disposed at the bottom of the column housing 1, and the specific structure of the belt pressing mechanism 45 may be selected as required. In one embodiment, the belt clamping mechanism 45 includes two adjustment wheels disposed side-by-side and a drive mechanism for driving the adjustment wheels in a plane of the belt 43, wherein the belt 43 is passed between the two adjustment wheels. When it is desired to adjust the tension of the drive belt 43, the position of the two adjustment wheels in the plane of the drive belt 43 can be adjusted by means of a drive mechanism so that the drive belt 43 is tensioned or relaxed. In another embodiment, the belt pressing mechanism 45 may include an eccentric shaft 451 and a roller 452 fixed to the eccentric shaft 451, the roller 452 abutting against the belt 43. When the driving timing pulley 41 rotates, the eccentric shaft 451 may be rotated (the eccentric shaft 451 may be rotated by a motor or the like) to adjust the degree to which the roller 452 of the eccentric shaft 451 presses the transmission belt 43. The greater the degree of pressing of the roller 452 against the transmission belt 43, the greater the tension of the transmission belt 43, and the friction between the transmission belt 43 and the driving timing pulley 41 is relatively increased. Thereby ensuring that the transmission mechanism 4 transmits the driving force to the rotating shuttle 3 to the maximum extent to drive the rotating shuttle 3 to rotate. In one application scenario, the adjustment of the tension of the drive belt 43 can also be achieved by replacing the drive synchronous pulley 41 and/or the driven synchronous pulley 42 with different diameters. Further, the driving synchronous pulley 41 and the driven synchronous pulley 42 are both gears, and the friction force between the driving synchronous pulley 41 and the driven synchronous pulley 42 and the transmission belt 43 can be increased, so that the relative slip between the driving synchronous pulley 41 and the transmission belt 43 and between the driven synchronous pulley 42 and the transmission belt 43 can be avoided.

Fig. 8 is a partially enlarged schematic view showing a rotary shuttle of the rotary shuttle driving device according to the present invention. As shown in fig. 8, the driven synchronous pulley 42 can be fixed to the rotating shuttle 3 by a rotating shuttle transmission shaft 44, one or more bearings 441 are sleeved on the rotating shuttle transmission shaft 44, and further, the bearings 441 can be any bearings capable of supporting the rotating shuttle transmission shaft 44 for rotation, such as a deep groove ball bearing, a needle bearing or a roller bearing. One or more bearings 441 are fixed on a fixing seat 442 fixed with the column housing 1. Further, in order to ensure that the position of the rotating shuttle transmission shaft 44 does not change (the rotating shuttle transmission shaft 44 only rotates around the axis of the rotating shuttle transmission shaft), different structures can be selected according to requirements to meet the requirements. In one embodiment, one or more bearings 441 may be welded to the fixed base 442 and the rotating shuttle drive shaft 44, respectively. In another embodiment, a stop portion 443 is disposed on one end of the rotating shuttle transmission shaft 44 close to the rotating shuttle 3 along the circumferential direction, and the bearing 441 is disposed between the stop portion 443 and the driven synchronous pulley 42. Further, the bearing 441 may include an inner race and an outer race that rotate relative to each other. Wherein the inner ring of the bearing 441 is respectively abutted against the stopper portion 443 and the driven synchronous pulley 42, and the outer ring of the bearing 441 is fixed to the fixed seat 442. Since the inner ring of the bearing 441 is fixedly abutted against the stopping portion 443 (rotating along the rotating shuttle transmission shaft 44) to be rotated and the driven synchronous pulley 42, when the driving synchronous pulley 41 drives the driven synchronous pulley 42 to rotate, the inner ring of the bearing 441 can synchronously rotate along with the driven synchronous pulley 42. Meanwhile, since the outer ring of the bearing 441 is fixed to the fixed seat 442 of the column housing 1 that does not rotate, the outer ring of the bearing 441 is stationary with respect to the column housing 1 when the inner ring of the bearing 441 rotates synchronously with the driven synchronous pulley 42. As rolling friction is known between the inner ring and the outer ring of the bearing 441, energy loss between the inner ring and the outer ring of the bearing 441 is small, so that the driving synchronous pulley 41 can transmit driving force to the rotary shuttle 3 to drive the rotary shuttle 3 to rotate with the lowest loss.

In addition, the number of the bearings 441 may be selected according to actual conditions (for example, an appropriate number may be selected according to a comparison between the axial length of the bearings 441 and the length of the rotating shuttle transmission shaft 44), and preferably, two bearings 441 are provided. Two bearings 441 are arranged along the axial direction of the rotating shuttle transmission shaft 44, a stop collar 444 is arranged between the two bearings 441, and the stop collar 444 is fixed with the fixed seat 442. Further, the outer diameter of stop collar 444 is larger than the outer race diameter of bearing 441, and the inner diameter of stop collar 444 is smaller than the outer race diameter of bearing 441 and larger than the inner race diameter of bearing 441. Meanwhile, an annular groove is formed in the fixed seat 442, and the size of a notch of the annular groove is the same as the thickness of the stop collar 444. In securing the two bearings 441, the stop collar 444 is partially seated in the annular recess and secured against the fixed seat 442. Furthermore, a plurality of clamping blocks are arranged in the annular groove, a plurality of notches matched with the positions and the number of the clamping blocks are arranged on the outer circle of the stop clamping ring 444, and when the stop clamping ring 444 is partially fixed in the annular groove, the clamping blocks are clamped in the notches, so that the stop clamping ring 444 can be limited to avoid the rotation of the stop clamping ring 444. In addition, the inner ring and the outer ring of one of the two bearings 441 respectively abut against the stopper portion 443 and the stopper collar 444, and the inner ring and the outer ring of the other bearing 441 respectively abut against the driven timing pulley 42 and the stopper collar 444. The fixing of the two bearings 441 is accomplished by the stopper 443, the stopper collar 444, and the driven timing pulley 42, thereby ensuring that the position of the rotating shuttle drive shaft 44 does not change.

In an application scenario, a tightening gasket 445 abutting against the driven synchronous pulley 42 is detachably fixed to an end of the rotating shuttle transmission shaft 44 away from the rotating shuttle 3, the tightening gasket 445 presses the driven synchronous pulley 42 to approach the stopper 443, and the tightening gasket 445 is detachably fixed to the rotating shuttle transmission shaft 44 by a screw. To further ensure that the position of the rotating shuttle transmission shaft 44 does not change when rotating, by tightening the arrangement of the spacer 445, the screw can be tightened to press the driven synchronous pulley 42 against the inner ring of the bearing 441, so that the acting force between the bearing 441 and the stop collar 444 and between the bearing 441 and the stop portion 443 is increased to ensure that the rotating shuttle transmission shaft 44 is fixed with the fixed seat 442 only through the bearing 441. Accordingly, the frictional force when the rotating shuttle driving shaft 44 rotates is reduced, and the energy loss when the rotating shuttle driving shaft 44 rotates can be reduced, thereby ensuring that the driving force is maximally transmitted to the rotating shuttle 3 to rotate the rotating shuttle 3. Furthermore, a gasket 446 is arranged between the two bearings 441, the gasket 446 abuts against the outer ring of one of the bearings 441 and the stop collar 444, and the stop collar 444 abuts against the outer ring of the other bearing 441. The spacer 446 can increase the friction force between the bearing 441 and the stop collar 444, so as to avoid the relative sliding between the bearing 441 and the stop collar 444 due to the small friction force, and further ensure that the driving force can be transmitted to the rotary shuttle 3 to the maximum extent to rotate the rotary shuttle 3. In addition, the material of the gasket 446 may be selected as desired. In one embodiment, the spacer 446 is made of rubber, and since the stopper 443 and the driven synchronous pulley 42 are pressed against each other to cause the bearing 441 to press the spacer 446, the spacer 446 is deformed, and accordingly, the friction force between the bearing 441 and the spacer 446 is increased. In another embodiment, the spacer 446 is made of a metal material, and preferably, the spacer 446 made of a metal material is provided with anti-slip threads, so that the outer ring of the bearing 441 and the spacer 446 are prevented from sliding relative to each other when the rotating shuttle transmission shaft 44 rotates.

It should be understood that the terms "first," "second," "third," and "fourth," etc. in the claims, description, and drawings of the present disclosure are used to distinguish between different objects and are not used to describe a particular order. The terms "comprises" and "comprising," when used in the specification and claims of this disclosure, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the disclosure herein is for the purpose of describing particular embodiments only, and is not intended to be limiting of the disclosure. As used in the specification and claims of this disclosure, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be further understood that the term "and/or" as used in the specification and claims of this disclosure refers to any and all possible combinations of one or more of the associated listed items and includes such combinations.

As used in this specification and claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to a determination" or "in response to a detection". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".

Although the embodiments of the present invention are described above, the descriptions are only examples for facilitating understanding of the present invention, and are not intended to limit the scope and application scenarios of the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.